VNQ
      +--------
VRNQU | VHQYXTZ
       -VRNQU
        =====
         WYUQT
        -LXGTJ
         =====
         VJMPTZ
        -VJTHLX
         ======
           PQWL

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: hard
hints: W << Z, T << L